From: Ethan Dicks (ethan.dicks_at_gmail.com)
Date: 2008-07-07 11:15:15
On Mon, Jul 7, 2008 at 6:16 AM, William Levak <wlevak@sdf.lonestar.org> wrote:
> On Thu, 3 Jul 2008, Ruud@baltissen.org wrote:
>
>> Hallo allemaal,
>>
>> I have two of these boxes. One with a sticker saying "Diagnostic clip
>> series 3000", containing a 2532. Its contents:
>> http://www.baltissen.org/files/diag3000.bin
>
> This file contains the same contents twice. Your EPROM is a 2516 not a
> 2532. It is also the same as my diagnostic EPROM for the non-6545 PET's.
ISTR a mention of a 2516 (2316?) in the scan of the instructions for the oldest
version of the clip (pre-6545). Perhaps they changed to a 2532 later
when that's
what they had lying around. The contents of Ruud's download are, of course
2K of code, duplicated. I have taken a preliminary pass at it with a
disassembler.
but no more than a glance. It appears that to make "printing" easy, they emit
strings right to screen memory at pre-calculated fixed X, Y positions - not even
a "print" subroutine in the ROM.
> I have transferred my diagnostic EPROM files to my pc. There are 3:
>
> non-6545 PET's - 2K
> 40 column 6545 PET's - 4K
> 80 column 6545 PET's - 4K
Nice. I don't have a CTRC PET with me, but I have more than a few
at home.
> My diagnostic device for the 6545 PET's has a switch that selects between 40
> or 80 columns, and contains both the 6545 EPROM's. I believe there was an
> older version of this device that had only the 40 column EPROM, and no
> switch.
I may have a 40-col--CTRC-only diagnostic clip at home, but I'm not
sure. I can't
check it for months.
> I have some instructions that go with these, that I need to transcribe, and
> then I will upload the package to zimmers.net.
Thank you for that.
I don't mind drawing up schematics of the innards with something like
EagleCAD, but I don't have a wiring diagram. Is that something that
you might be able to provide as well? The docs I just read mentioned
one chip inside besides the ROM, so it shouldn't be too complicated
to describe.
-ethan
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